On Thu, 24 May 2012 23:45:20 -0400, Tom Gardner Mars@Tacks wrote:

Is it a good or bad idea to change over to one of the new refrigerants
that claim lower head pressure, cooler air and substantially reduced
electricity usage?

If it were that simple, R22 would be getting changed out all over.
Pretty sure you got to have a compressor designed for the new stuff.

if you like being insulted, go ask over on alt.hvac (don't have theNG
name quite right)

Karl